Concrete Pump Hand Signals: The Operator's Field Guide

Site's too loud for talk. The boom's swinging, the agi truck's reversing, the saw's screaming, and you've got a finisher screaming over a placer. Hand signals are how pumpers and operators actually communicate on a live pour — and getting them wrong burns concrete, time, and trust.

 

This is the Pumplife field guide to standard concrete pump hand signals every operator, pumpy, and finisher should know cold.

 

Why hand signals matter

 

On a concrete pump, the operator at the remote often can't see the placer at the end of the line or the underside of the boom. Site noise kills voice. Radios fail. Hand signals are universal, instant, and unambiguous when you're trained on them.

 

Good signals = clean pour. Bad signals = blowouts, cold joints, spillage, hose whip, and finger-pointing afterwards. Most crews who pour together regularly develop their own shorthand, but the core signals are standard across Australia and most of the world.

 

The ten signals every crew should know

 

Start pumping

Closed fist with thumb extended, rotating in small circles. The remote operator engages the pump and starts placing. Simple, hard to mistake for anything else.

 

Stop pumping

Flat open hand, palm out, held still in front of the body — the universal stop. The operator stops the pump immediately. Use this and only this when you mean stop. Don't wave, don't hesitate.

 

Slow down

Palm flat, facing down, lowered slowly toward the ground. Use when the placer is getting ahead, the formwork's filling fast, or you're hitting a finisher.

 

Speed up

Palm flat, facing up, raised slowly. The placer needs more concrete — maybe the form's eating volume, maybe you're behind the agi truck schedule.

 

Reverse (suck back)

Index finger pointed, drawing small backward circles. The operator reverses the pump for a second or two to suck concrete back into the hopper. Used to stop dribble at the end of a section or before the operator pulls a hose.

 

Boom up

Thumb pointed up, arm extended overhead. Operator raises the boom. Used to clear the placer, an obstacle, or to position for the next pour location.

 

Boom down

Thumb pointed down, arm extended below. Operator lowers the boom.

 

Boom left / Boom right

Arm extended in the direction of the desired movement. Some crews use a sweep with the whole arm; others use a flat hand pointing.

 

Fold / pack up

Arms crossed in front of chest like an X. Operator folds the boom and prepares to wash out. Save this for the actual end of the pour.

 

Washout

Hand making a circular scrubbing motion at chest height. Tells the operator to start washout procedures.

 

Who should be giving signals

 

One person. Always one person. The moment two crew members are giving signals to the same remote operator, you have chaos and a blowout in your near future. The placer is usually the signaller. The pumpy or operator on the remote watches that one person.

 

If the signaller needs to switch — say they hand the hose to a mate — it's a verbal handoff first, then the new signaller takes over with a clear "start pumping" or "hold."

 

Line-of-sight rules

 

The operator must be able to see the signaller. If the boom moves around a corner or the placer disappears below floor level, you stop and reset. Either reposition, use radios, or appoint a relay.

 

Never signal from behind the pump. Always be where the operator can see your hands clearly.

 

The two-handed emergency stop

 

Both hands up, palms out, arms extended overhead. This is the panic stop. It means stop everything immediately — something is wrong. Operator stops, brakes the pump, and waits for verbal info. Use it for blowouts, hose ruptures, anyone fallen, electrical contact, anything.

 

Signals between operator and agi driver

 

The agi truck driver also takes hand signals from the operator or pumpy when reversing in:

 

Keep coming: open palm waved toward the driver in a come-here motion.

Stop: flat hand, palm out.

Cut left / cut right: arm pointing the direction the rear of the truck should go.

Straighten up: both hands flat, palms toward each other, pulled apart slowly.

That'll do: flat hand chopping motion at neck height.

 

What to do when signals fail

 

If you and the operator are not on the same page, stop the pump. Walk over. Talk it out. Don't try to fix a comms breakdown mid-pour by gesturing harder.

 

If the radio's dead and you can't see the operator, send someone to relay. If you can't get a relay, stop pumping until you can.

 

Training tips for new pumpys

 

New pumpys, this is the single fastest way to look like you know what you're doing on a pour:

 

Learn the ten core signals before your first day on the line.

Watch the operator's face on the remote — if they look confused, your signals are unclear.

Use big, slow signals. Don't flick. Don't mumble with your hand.

Never stand behind the boom and signal sideways.

Never turn your back to the operator while pumping.

Watch other pumpys with 10+ years on the line. They'll have eight signals you've never seen and you'll pick up half of them by lunchtime.

 

The Pumplife take

 

Every good crew has a rhythm. Hand signals are the metronome. Get them clean, keep them sharp, and the pour runs itself. Get them sloppy and the operator's flying blind — and a blind boom is a problem.

 

The gear we make at Pumplife is for the crews that take the craft seriously. Hi-vis that survives a wash-down, hoodies that take a knee-out on a 6am pour, and tees that fit like you've worn them for a year. Operator-worn, owner-operator built.